Silica brick for hot blast stove

A hot blast stove and silica brick technology, which is applied in the field of refractory materials for hot blast stoves, can solve the problems of cumbersome production process and fluorite content, and achieve the effects of simplifying the production process, reducing cracks in silica bricks, and excellent high-temperature performance

Active Publication Date: 2015-12-16
REFRACTORY MATERIAL OF SINOSTEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a silica brick for hot blast stoves, which overcomes the problems of various kinds of additives in the production of silica bricks for hot blast stoves, cumbersome production process, and the raw material formula contains fluorite, etc. types, simplify the production process, reduce the technical effect of the error probability in the production process, and find suitable raw materials to replace fluorspar to improve the performance of the product

Method used

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  • Silica brick for hot blast stove

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Effect test

Embodiment 1

[0045]Silica bricks for hot blast stoves, the weight percentage of the components is: 28% of silica with a particle size of 2.18mm, 41% of silica with a particle size of 1.65mm, 10% of silica with a particle size of 2 Content≥98%, Fe 2 o 3 Content≤0.50%, Al 2 o 3 Content≤0.5%. Waste brick clinker is SiO 2 Waste silica clinker with a content of not less than 94.5%. The addition of composite additives is 6.5%, which is a mixture of lime, iron scale and water. The content of CaO in the composite additives is 25%, and the content of iron scale is 5%; the addition of special additives is 3.7%, and the mass percentage of each component For: bentonite: 25%, calcium hydroxide powder: 30%, clay: 20%, feldspar powder: 10%. The addition of pulp is 0.8%.

[0046] The firing process is:

[0047] (1) Weigh silica, waste brick clinker, and special additives according to the composition ratio of the above claims, and dry mix them uniformly in a wet mill to form a mixture A, and weigh a...

Embodiment 2

[0053] Silica bricks for hot blast stoves, the mass parts of the components are: 30 parts of silica with a particle size of 2.18mm, 28 parts of silica with a particle size of 1.65mm, 18 parts of silica with a particle size of 2 Content≥98%, Fe 2 o 3 Content≤0.50%, Al 2 o 3 Content≤0.5%. Waste brick clinker is SiO 2 Waste silica clinker with a content of not less than 94.5%. The addition of composite additive is 7.0%, which is a mixture of lime, iron scale and water. In the composite additive, CaO: 27%, the content of iron scale is 4%; the special additive is 4.5%, and the mass percentage of each component is: Bentonite: 35%, calcium hydroxide powder 35%, clay: 25%, feldspar powder: 20%. The amount of pulp added was 1.2%. Using calcium hydroxide powder instead of fluorite has low cost, no toxic and side effects, simple preparation process, excellent product performance, and is suitable for mass production.

[0054] The firing process is:

[0055] (1) Weigh silica, waste...

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Abstract

The invention discloses a silica brick for a hot blast stove, which comprises following materials in percentage by weight: 20 to 35 percent of silica with particle size of 2.18mm, 40 to 50 percent of silica with particle size of 1.65mm, 10 to 20 percent of silica with particle size less than 0.1mm, 10 to 20 percent of waste silica clinker, 0.5 to 1.5 percent of paper pulp, 6 to 8 percent of composite additive and 2.5 to 5 percent of dedicated addition. The composite additive is of a mixture of lime, iron scale and water, and the mixture comprises the components in percent by mass: 24.0 to 28.0 percent of CaO, 3.5 to 6.0% of iron scale and dedicated additives of bentonite, Ca (OH) 2 powder, clay and feldspar. According to the silica brick disclosed by the invention, the types of the addition are reduced by adjusting a raw material formula, the production process is simplified, and the error probability of a production process is lowered; the waste silica clinker is added, so the volume expansion of quartz type conversion is effectively lowered, silica brick cracks are reduced, the yield rate is improved, and the energy saving is realized; the composite additive and dedicated additives can improve the bonding property of pug, are conductive to shaping, and are conductive to stabilizing the quartz type conversion of the silica in sintering.

Description

technical field [0001] The invention relates to a refractory material technology for a hot blast stove, in particular to a silica brick for a hot blast stove. Background technique [0002] At present, the traditional raw material formula for the production of silica bricks for hot blast stoves is a certain amount of silica granules, a certain amount of silica fine powder, plus additives such as feldspar, fluorite, clay, etc., and then add pulp, lime milk, Iron scale powder, etc. The weighing ratio of too many kinds of substances in the raw material formula makes the production process cumbersome, and a little carelessness will cause production errors and affect the product quality. Moreover, the underground reserves of fluorite in the raw material formula are limited, and the market price is high. And it is highly corrosive during use, which is not conducive to protecting the environment. Contents of the invention [0003] The technical problem to be solved by the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 吕桂英刘勇
Owner REFRACTORY MATERIAL OF SINOSTEEL CORP
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